To find out how wide the door should be on the scale drawing, you can use the scale factor of 1 to 40.
First, calculate the width of the door on the scale drawing:
Width on scale drawing = Actual width of the door / Scale factor
Width on scale drawing = 1.2 m / 40
Width on scale drawing = 0.03 m
So, the width of the door on the scale drawing should be 0.03 meters.